[Feature Request] Add isNextEnabled and isPreviousEnabled to MediaSession

[za722-ic]

Describe the problem/motivation

We currently have the ability to skip to the next track or previous track using the media provider's next and previous functions. However, not all playback sessions have a next/previous option available. Having that information in the MediaSession would be useful as then someone could e.g. disable the skip next button in their UI if isNextEnabled is false.

Describe the solution you'd like

The GSMTC class has a GetPlaybackInfo() function, which returns an instance of GlobalSystemMediaTransportControlsSessionPlaybackInfo, which has a Controls property. In that Controls property, we have isNextEnabled and isPreviousEnabled. Having these values easily accessible in Zebar's MediaSession would be great!

Alternatives considered

No alternatives considered.